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(No Model.) 3 SheetsSl1eet 1.

O. HAM-ANN. SHEARS.

No. 509,125. Patented Nov. 21; 1893. k

(No Model.) 3 SheetsSheet 2. C. HAMANN.

SHEARS.

Patented Nov. 21, 1898.

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(No Model.) 3 Sheets$heet 3.

C. HAMAN'N. SHEARS.

N0. 509,125. Patented Nov. 21, 1898.

UNITED STATES:

PATENT OFFI E.

CARL HAMANN, OF REINBEOK, GERMANY.

SHEARS.

SPECIFICATION forming part of Letters Patent No. 509,125, dated November21, 1893.

7 Application filed February 14, 1893- Serial No. 462,272. (No model.)

To all whom it may concern:

Be it known that I, CARL HAMANN, of Reinbeck,in the Kingdom of Prussia,German Empire, have invented a' new and useful Improvement in Shears,Scissors, Nippers, and the Like, of which the following is aspecification.

This invention relates to an improved construction of shears, scissors,pinchers and the like, the essential features of which are that thehandles are pivoted separately on the blades or jaws, one handle on oneblade or jaw and the other handle on the other blade or jaw, while thesaid blades or jaws are themselves pivoted together on a pivot common toboth and each handle is connected by means of a link to that blade orjaw to which the other handle is directly pivoted. In this newconstruction pressure applied to either of the handles is transferred tothe sharp edges of the blades or meeting faces of the jaws, namely, tothat blade or jaw to which the handie is connected by means of the linkand also to that blade or jaw on which the handle has its point ofsupport.

In comparison to other known constructions this invention provides thatthe pressure applied upon the handles is practically fully utilized,while in all cases where the handles possess only one pivot common toboth a great deal of the pressure exercised upon the handles ispractically lost in this pivot.

This invention is illustrated in the accompanying drawings in Which-Figures 1, 2, 3, 4 illustrate my invention applied to garden shears,Fig. 1 being an edge View, Figs. 2 and 3 side views showing the shearsin difierent positions, and Fig. 4 representing a transverse section inthe line 00a; of Fig. 3. Fig. 5 is a side view of a pair of tailorsshears embodying the invention.

Figs. 6, 7, 8 illustrate the invention as applied to pruning shears,Figs. 6 and 7 being side views showing them respectively closed andopen, and Fig. 8 representing a transverse section in the line y y ofFigs. 6 and 7. Figs. 9, 10, 11 represent a pair of nippers embodying myinvention, Figs. 9 and 11 being side views showing them respectivelyopen and closed and Fig. 10 being an edge View.

Similar letters and numerals of reference designate corresponding partsin all the fig ures.

Referring to Figs. 1 to 4, G G show the handles pivoted severally on thepins 0 0 on the cutting jaws or blades A and B, which latter are alsopivoted together on the pivot ccommon to both. The handles G G areconnected to the blades B A respectively, the handle Gto'the blade B andthe handle G to the blade A, by means of the respective pivoted linksll, each of these engaging on a pin 1 on the respective handle and'on apin 2 on the respective blade, the pivots of the said link connectionsbeing separate from the-pivots by which the handles and blades arepivoted together- 'In pressing the handles together from their openposition shown in Fig. 3 to their closed position shown in Fig. 2, thepressure of each handle is transferred from two workingpoints to the twoblades, namely, from the handle G through one working point consistingof the pivot 0, directly to the blade 'A, and through a second workingpoint, consisting of one of the pivots 1, through the link Zto the bladeB, also in like manner, from the handle G through one working point,consisting of the pivot 0', directly to the blade B, and through asecond working point, consisting of the other pivot 1, through the linkZ to the blade A. Consequently the pressure exerted on the handles iscompletely trans- I ferred to the blades, which is not the casein shearsin which the handles have a pivot in common. Moreover by this system ofconnection between the blades themselves and between the blades and thehandles a very powerful leverage is produced and a great movement of thehandles relatively to that of the blades is obtained without making thehandles of a length disproportionate to the blades.

In the tailor s shears shown in Fig. 5, the construction is the same asin Figs. 1, 2, 3, 4., the pivot in common 0 of the blades A and B beingbelow or behind the working points of the links, the consequence ofwhich is a superior cutting effect since the blades form a more acuteangle when in their open position, the points of support of the handlesbeing between the links and the pivot c of the blades. 7

In Figs. 6, 7, 8, the pivot c of the blades is above the links and belowthe latter are the points of support 0 0' of the handles. In otherrespects the construction is as above described with reference to Figs.1, 2, 3, 4:.

In the pinchers shown in Figs. 9, 10, 11, the only variation from theconstruction described with reference to- Figs. 1, 2, 3, 4, is that thepivoted points are inverted, in consequence of which the closing of thejaws is effected by a pushing of the links so that the links are here incompression while in Fig. 1 the blades are drawn together by means ofthe links which are thus in tension.

What I claim as my invention is The combination in scissors, shears,pinchers and the like, of two blades or jaws piv- CARL HAMANN.

Witnesses:

ADOLF KRAUS, C. J. MELKOFF.

